| 摘要 |
<P>PROBLEM TO BE SOLVED: To automatically determine two or more process target layers on which a hole is to be formed, on the basis of a load torque acting on a drill and to facilitate piercing and improve process efficiency under the process condition set for each process target layer, in the formation of the hole on a workpiece having a plurality of forming areas sectioned by being formed from materials having different material quality. <P>SOLUTION: There is disclosed a piercing device for forming the hole 70 in the workpiece 50 having forming layers 51 to 56 sectioned by the materials having different material qualities. In the piercing device; a process target layer determination means determines the process target layers 51a to 56a in order of piercing on the basis of the start of piercing and the change of the load torque acting on the drill 4; a process condition determination means determines a set processing rotation speed and a set processing advancing speed corresponding to forming material of each of the process target layers 51a to 56a; and a drive control means controls a main axis motor and a feed motor so that the drill 4 forms the hole 70 at the set processing rotation speed and the set processing advancing speed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
